Final answer:
The scenario illustrates the need for food and drug regulation because the medication did not carry accurate ingredient labels.
Step-by-step explanation:
The scenario of Blake purchasing treatment for his arthritis from a traveling medicine man in the late 1800s illustrates the need for food and drug regulation because the medication did not carry accurate ingredient labels. This lack of accurate information prevented Blake from knowing what he was consuming, which could have potentially harmful effects on his health. The need for regulation arose to protect consumers from misleading or dangerous products.